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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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In Eastern Europe and Russia, interferon is administered intranasally in varied doses for the common cold and influenza. It is claimed that this treatment can lower the risk of infection by as much as 60–70%.
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The human body produces and destroys 15 million blood cells every second.
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By definition, when a medication is administered intravenously, its bioavailability is 100%.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.